You can also make yourself a savemii free out of a gamecube controller, this will allow you to boot discs without going through the system menu, so you can use a game with an update on it to reinstall critical files or Zelda TP to run the twilight hack (if you still have hacked save on your wii) and load AnyRegionChanger or wad manager to fix your wii. Have a look here

Thanks for the usefull post. I only have got one question about it. I have a bricked wii and the diagram says that the only possibilty I've got is install a drive chip. Can I use a solderless chip like the drivekey or do I have to use a soldered one like the wiikey2?